Malicious PDF — malware analysis report

Static analysis result for SHA-256 de814c2593673adc…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 01:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: af43fbd309e2e24ce43780c4ecaad63d SHA-1: 78daaa8b9c0da64bda2cb3ce9f73bcc6447b56af SHA-256: de814c2593673adc9f0538ed15d2baea66210c8d8095bb68ff97d56f05ffbd1e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a 'worksheet' and 'answer key', which serves as a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/pbw?utm_term=enthalpy+calorimetry+chem+worksheet+16+4+answer+key PDF link annotation
    • https://wojizenufojanog.weebly.com/uploads/1/3/4/7/134724603/relobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_601fb10371cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_60681c3620cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5ffa78e4e0621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_60c0e58a7d657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_6062ceb4d2d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_600d34e03f90f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5fe28581a8b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5fdb298aca622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_605b10273c630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_603bb9209ab84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60b7edca18ea4.pdfIn PDF document text
    • https://pexesalakodosok.weebly.com/uploads/1/3/4/6/134650812/9115605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5ffcd17560103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd32d47aa628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_601f2d12631b0.pdfIn PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/futazusutijavom_buximavi_vatubeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_60328238aec01.pdfIn PDF document text
    • https://zaranofe.weebly.com/uploads/1/3/5/9/135967679/5500818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae85894d-827f-4b95-b5e2-a1094af2beb7/davuxapewumezezas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9677b0ab-44d4-4c7b-bb16-1e7864e6b8b5/wagner_steamer_905_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98bcec50-94b6-45fa-b8e1-c6d805c9bc46/nuwave_brio_air_fryer_36001_instructions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 5684 bytes
SHA-256: c6d2b4aefb9d5aa2b94c33975e7cad06a6c1c20cd1055213a83e4324972508d0
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 11864 bytes
SHA-256: 6e7b89cdf6028de31c927f4ba41bfac4ee539b3578d910fe8a8a0d18f3ce89dc

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